Dumortierite Chemical: Al6.5-7BO3(SiO4)3(O,OH)3. Clades: Al2SiO5 group; Nesosilicates; Silicate minerals; Lapidae. rom Related postsProtium javanicumNovember 19, 2020Normanbya normanbyiMarch 10, 2019Galbulimima belgraveanaMarch 10, 2019 Previous postKyaniteNext postNorbergite